1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. College of Engineering, Southern University of Science and Technology, Shenzhen 518055, China;
3. College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
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Poor corrosion resistance is a bottleneck problem that restricts the wide application of magnesium alloys. The corrosion pain points in the Mg industry include galvanic corrosion of magnesium alloy connectors, easy corrosion after surface protective coatings being damaged, and corrosion of magnesium alloys under force/chemical interaction. The reasons behind these corrosion pain points are analyzed, and the scientific problems about the corrosion of magnesium alloys are proposed, including the control steps of electrochemical corrosion, the galvanic corrosion law under multi-factor coupling, the corrosion mechanism under force/chemical interaction, the construction and response mechanism of low-cost protective coatings. Based on the comprehensive consideration of the corrosion problems of magnesium alloys from the aspects of corrosion mechanism→materials→service environment→processing→service performance→surface protection→methodology, the corrosion mechanism of magnesium alloys is clarified, and the low cost, high corrosion resistance and multi-functional protective coatings are developed to promote the wide application of magnesium alloys.